Improvement in steel-heating furnaces



PATENT i OFFICE.

WILLIAM svi(Qi-NDELL, 0F ALLEGHENY, PENNSYLVANIA.

IMPROVEMEINTIN STEEL-HEATING Specification forming part of Letters Patent N o. [77.437, dated May 16, 1876; application filed .March 7, 1876.

To all whom it may concern Be it known that I, WILIZIAM SWINDELL, of Allegheny, in the county ofAllegheny and State of Pennsylvania, haveinvented a new and-useful Improvement in Steel-Heatin g Furnaces; and I do hereby declare. the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing, forming part of this specification, in whi'ch- Figure 1 is a vertical section on the line or 01:,Fig. 2, and Fig. 2 is a horizontal section on the line y y, Fig. 1, of a furnace embodying my invention. l

vLike letters refer to like parts in the several figures.

My invention relates to that class of metallurgic furnaces termed heatingffurnaces, and is especially adapted for heating articles of steel, such. as plowshares, mold-boards, springs, or like articles preparatory to bending or tempering, but the construction will be found generally applicable inheating-furnaces for other purposes than those specified.

I will now proceed to describe my invention.

so that others skilled in the art to which it appertainsmay apply the same.

In the drawing, A indicates the firechamber of a heating-furnace, provided with grates a a, hinged as at al, and supported in front by latches a2, which can be withdrawn to let down the grate at will.l T he ash-pit-B is closed by doors b b, and perforated at b and b2 forblastpipes.- Above the grate the chamber A is closed in front, but provided at the side with by radiation rather than by the direct -rays ot'v heat. By these devices the equable temperature of all'parts of the hearth is insured. E

'indicates the charging-door, preferably placed in the end of the furnace, and parallel to the downtake Vor.combustion-flue e, by means of which the hearth communicates with the flues ff f f', the former of which conduct the products of combustion beneath the hearth toward the tire-chamber, and the latter or return ilues reconduct the products of combustion or waste gases, which have given up their heat `to the hearth and blast, to the uptake F. F

` flue or stack, G, the whole supported upon the rear of the furnace, and by suitable plates I. K are pipes for the hot-blast, and are arranged .within the walls which separate the ues f and may be opened'to admit air -to the waste gases or to cool the hearth, or may be closed by plugs or caps at will.

The `operation of the furnace is as follows: The vfire having been started in lire-chamber A the products of combustion are directed by the inclined bridge-wall against the crown, and, passing above the hearth, dip at the rear end of the furnace, and escape from the hearth throughV e into flues ff, along which they pass forward, returning by fj", thus heating the' blast and bottom of the hearth before they nally reach the uptake. As soon as the hearth is sufficiently heated for the purpose intended, the door E is raised and the charge introduced, any air which enters the door be ing drawn into the flues e f f with' the products of combustion, which cross that end of the furnace.' j s v The advantages of my invention are, first, that any kind of fuel may be employed Without regard to its impurities; second, the articles placed on that portion of the hearth next the fire-chamber are not unduly heated; and, thirdly, that no air is admitted to cool the hearth or affect the articles heated thereon when inspecting or charging the furnace.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 1s

and the blgist-pipes' K, arranged beneath the hearth, jamai in rotation thereto, sbstantially as and Tor the purpose set forth.

In'testimony whereof I, the said WILLIAM 'SW1NDELL, have hereunto set my hand.

WILLIAM SWINDELL.

1. In combination with the hearth of a. heati ing-furnace, 'the overhanging bridgewall, inr clincd or forming an acute angle therewith, substantially as and for the purpose sct forth.

2. In combination with the hearth of a heating-furnace the door E, located as v specified, and the ues e f, substantial-1y as Spci-edf.

- Witnessesf 3. In combination with the hearth and fire- F. W. RITTER, Jr., JAMES I. KAY..

chamber of a heating-fiirnnce the ues eff, 

